[4.02] The Evolution of Galaxies in X-rays

R. E. Griffiths, A. Ptak (Carnegie Mellon University)

Galaxy evolution in visible light is now fairly well
understood via HST surveys, including the Hubble Deep Field
and Medium Deep Survey. These results, taken together with
previous data on the correlations between X-ray and optical
fluxes, allow us to predict the X-ray evolution of the major
galaxy morphological types with redshift. Evolution in the
ratio of X-ray to blue luminosity would produce significant
changes to these predictions, and this possibility is
explored following the work of White and Ghosh on the
evolution in the numbers of low-mass X-ray binaries. The
consequences for deep surveys with AXAF, XMM and future
observatories is summarized.

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